C# How to stop while loop when enter pressed

Question

I have a homework where I have to make a program that asks numbers for ten times in a loop and in the end gives the sum of those ten numbers. But it also must be possible to stop the loop and give the sum of numbers when enter is pressed.

I have tried something like this in while loop, but it didn't also work:

if( Console.KeyAvailable && Console.ReadKey( true ).Key == ConsoleKey.Enter ) break;

Can anyone suggest solutions?

Thanks in advance!

           {
            int i = 0;
            int number;
            string number_s;
            int sum = 0;


            while (i < 10)
            {
                { 
                i++;

                Console.WriteLine("Enter number:"); 
                number_s = Console.ReadLine(); 
                Int32.TryParse(number_s, out number);

                    sum += number;
                }
            }
           Console.Write("Sum is: {0}", sum);
          }

When you press Enter your number_s will be set to an empty string (string.Empty) now you just need to check for that and use the break keyword to exit the loop — Steve
– Steve, Commented Dec 1, 2019 at 8:55
Just to explain why your attempt failed: ReadLine is blocking. It will wait until there is something and an Enter in the buffer. KeyAvailable and ReadKey are non-blocking. Thus they will either way encounter empty buffer: before you enter the number or after ReadLine emptied the buffer. — ZorgoZ
– ZorgoZ, Commented Dec 1, 2019 at 9:03
What do you want to do when the user enters "Lilian", or "Banana" instead of a number? — Zohar Peled
– Zohar Peled, Commented Dec 1, 2019 at 9:39

Harikrishnan · Accepted Answer · 2019-12-01 09:43:20Z

1

The below code should work fine.

while (i < 10)
{
    i++;
    Console.WriteLine("Enter number:"); 
    number_s = Console.ReadLine(); 
    if(string.IsNullOrEmpty(number_s))
        break;
    input = Convert.ToInt32(number_s);
    sum += input;
}
Console.WriteLine("The sum of the entered numbers are : {0}", sum);

answered Dec 1, 2019 at 9:43

Harikrishnan

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3 Comments

Zohar Peled Over a year ago

If the user enters "Harikrishnan" instead of a number, the previous number will get added again. Is that the desired behavior? I think not...

Holger Over a year ago

@ZoharPeled Convert.ToInt will throw an exception in this case. So your behaviour will not happen.

Zohar Peled Over a year ago

@Holger yes, that's correct. I think I've misread the answer (question was using int.TryParse so I assumed answer was using that too).

Athul Raj · Accepted Answer · 2019-12-01 09:26:03Z

1

When you press Entery Key, the value in number_s will be empty. You just need to use

if(string.IsNullOrEmpty(number_s))
 break;

answered Dec 1, 2019 at 9:26

Athul Raj

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